Yes, Stine-Jac was a Canadian label. One of a few small record labels that Willi Williams and Jackie Mittoo were involved with while they were living in Canada. Discogs has what looks like a complete discography:

The label was a collaboration between Jackie Mittoo (the "Jac" part) and an financier whose name I am drawing a blank on right now, but will think of later. But the "musical" side of it was pure Jackie.

The 10" came out first, it was released at a time when that format was popular.....quite a few 10" releases on Studio One, Channel One and other labels were making the rounds. The 7" is a later pressing.